Engine

Abstract

There is provided an engine (10) including a gas turbine unit and a plurality of combustion units (80) that supplies combustion gas (51) to the gas turbine unit. Each of the combustion units (80) includes: a combustion chamber (11); a first mechanism (71) that moves a first wall surface (81a) that configures a part of the combustion chamber, using an elastic force of a spring (83) to reduce a volume of the combustion chamber (11) and pressurize a gas (58) inside the combustion chamber; and a second mechanism (72) that opens and closes an exhaust port (85) of the combustion chamber to control the timing at which combustion gas (51) is discharged from the exhaust port.

1 . An engine comprising:
 a gas turbine unit; and   a plurality of combustion units that supply combustion gas to the gas turbine unit,   wherein each of the plurality of combustion units includes:   a combustion chamber;   a first mechanism that moves a first wall surface that configures a part of the combustion chamber using an elastic force to reduce a volume of the combustion chamber and pressurize gas inside the combustion chamber; and   a second mechanism that opens and closes an exhaust port of the combustion chamber to control timing at which the combustion gas is discharged from the exhaust port.   
     
     
         2 . The engine according to  claim 1 ,
 wherein the exhaust port is provided on a movement path of the first wall surface and the first mechanism also serves as the second mechanism.   
     
     
         3 . The engine according to  claim 1 ,
 wherein each of the plurality of combustion units includes a third mechanism that holds a position of the first wall surface against the elastic force.   
     
     
         4 . The engine according to  claim 1 ,
 wherein each of the plurality of combustion units includes a fourth mechanism that holds the position of the first wall surface against a pressure inside the combustion chamber.   
     
     
         5 . The engine according to  claim 1 ,
 wherein each of the plurality of combustion units includes a fifth mechanism that moves the first wall surface against the elastic force in a direction where the volume of the combustion chamber expands.   
     
     
         6 . The engine according to  claim 5 , further comprising:
 an electric actuator that drives the fifth mechanism; and   an energy regeneration mechanism that generates electrical power using the electric actuator when the engine is running.   
     
     
         7 . The engine according to  claim 5 , further comprising:
 a mechanism that drives the respective fifth mechanisms of the plurality of combustion units independently.   
     
     
         8 . The engine according to  claim 1 ,
 wherein each of the plurality of combustion units includes:   a piston that moves inside the combustion chamber and is equipped with the first wall surface that faces the combustion chamber; and   a gas supplying system for temporarily storing compressed gas that is to be supplied to the combustion chamber, in a region on an opposite side of the piston to the combustion chamber.   
     
     
         9 . The engine according to  claim 1 ,
 wherein each of the plurality of combustion units includes a critical nozzle that connects the combustion chamber and the gas turbine unit, and   the second mechanism intermittently opens and closes a passage between the combustion chamber and a throat part of the critical nozzle.   
     
     
         10 . The engine according to  claim 1 ,
 wherein the gas turbine unit includes a radial turbine unit, and   the plurality of combustion units are arranged around a circumference of the radial turbine unit.   
     
     
         11 . A power generating apparatus comprising:
 the engine according to  claim 1 ; and   a generator connected to the gas turbine unit.